TERMIUM Plus^®

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In order to minimize the plasma loss arising from interactions with background gas particles, the plasma is contained in an ultra-high vacuum system. The high vacuum is obtained by using turbo-molecular pumps for the initial vacuum and liquid helium cryopumps for the pumping to very low pressure.  1, fiche 1, Anglais, - ultra%2Dhigh%20vacuum%20system

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A mass of gas or dust within a galaxy, typically visible either as a luminous patch or as a dark silhouette against a brighter background.  2, fiche 2, Anglais, - nebula

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Masa de materia cósmica en estado muy diluido que se presenta como una nube y da origen, al concentrarse, a una estrella o enjambre de ellas.  2, fiche 2, Espagnol, - nebulosa

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La Vía Láctea es una nebulosa.  3, fiche 2, Espagnol, - nebulosa

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Term(s) taken from a Canadian laboratory-equipment company’s catalogue.  1, fiche 3, Anglais, - background%20gas

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Terme(s) tiré(s) du catalogue d'une compagnie canadienne d'équipement de laboratoire.  1, fiche 3, Français, - gaz%20de%20fond

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Flame Emissivity Detector. Another detector based on monitoring a specific property of a flame, its emissivity, was developed by Grant, who mixed coal gas in constant proportions with the effluent from a chromatographic column; this coal gas/effluent mixture burned at a wide stainless steel jet. The emissivity of the flame, changing as the flame's carbon content is varied, is measured with the aid of a metal reflector, glass condensing lens, and selenium photocell; these are held in place from each other at their proper optical distances.... For low background emissivity values, response is nonlinear. However, by controlling the coal gas flow rate to maintain emissivity between 0. 60 and 0. 80 mV, detector response is linear over a wide temperature range.  1, fiche 4, Anglais, - flame%20emissivity%20detector

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For the determination of combustible components of organic origin in gas chromatographic effluents, various principles of detection based on flame reactions have been utilized, namely, the hydrogen flame temperature, flame emissivity, and flame ionization detectors. In all reported systems, specific flame properties were monitored. Whereas Scott measured the flame temperature of the exit gas at a small jet and Grant the flame’s emissivity by optical means, Mc William and Dewar and Harley et al. advanced new detection concepts based on the electrical or ionization properties of hydrogen/oxygen flames.  1, fiche 4, Anglais, - flame%20emissivity%20detector

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[Nelson, Ressler, and Hawes] noted that sensitivity of radiation detection in terms of peak height for a given amount of injected activity is a function of many variables :(1) chamber volume,(2) type of radioactive emitter...,(3) noise and background level,(4) diluent gas, and(5) carrier and diluent gas flow rates.  1, fiche 5, Anglais, - radioactive%20emitter

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Lovelock developed a small detector intended for use with open tubular columns, and a new triode detector having a sensitivity 1000 times greater than his original detector... The triode detector... incorporates a ring electrode, in addition to the normal anode and cathode electrodes, which separates the background current(positive ions liberated by vapor/metastable argon reactions or collisions) of the primary electron stream from the signal current. Basically, both detectors are similar to the simple device in design : their brass or stainless steel chambers function as cathodes; their anodes of the same material are supported coaxially within the chamber by a polytetrafluoroethylene insulator; both contain ports for introduction and escape of the chromatographic column gas effluent from the detectors; and each have a suitable source of alpha or beta radiation.  1, fiche 6, Anglais, - triode%20detector

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Terme(s) uniformisé(s) par CP Rail.  1, fiche 7, Français, - plaque%20de%20gaz%20toxique%20sur%20fond%20carr%C3%A9

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